--  @testpoint:opengauss关键字rename(非保留)，作为函数名

--关键字不带引号-成功
drop function if exists rename;
create function rename(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function rename;
--关键字带双引号-成功
drop function if exists "rename";
create function "rename"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "rename";
--关键字带单引号-合理报错
drop function if exists 'rename';
create function 'rename'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `rename`;
create function `rename`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/